Portable scraper



Sbt. 30, 1958 J. J. BARKER 2,853,820

PORTABLE SCRAPER Filed Jan. 3, 1956 INVENTOR. e/o/w d. Banker ice United States Patent 2,s5s,s20 PORTABLE SCRAPER John J. Barker, Independence, Mo., assignor of one-half to Irvin C. Kleinschmidt, CordenMo.

Application January 3, 1956, Serial No. 556,877 3 Claims. c1. 41-1 This invention relates to apparatus for scraping oil pockets in ways and gibs of machine tools and the like and particularly to a relatively lightweight, manually manipulable, portable tool having as a component part thereof in a single unitary structure, not only the cutter blade itself, but theprime mover therefor and interposed mechanism for actuating the cutter blade as the prime mover is energized.

For the most part scrapers for the aforementioned purposes have normally been in the nature of small chisel-like instruments, and so far as I am aware, the only power devices heretofore proposed have been cumbersome, large and expensive and not adaptable for use in small confined places.

It is the most important object of the present invention therefore, to provide a portable device that may be used universally for virtually any scraping operation notwithstanding problems of accessibility.

Another important object of the present invention is to provide a manual apparatus having a handle-like support for the prime mover and the cutting mechanism, which support may be placed in use by resting against a shoulder of the user thereby freeing his hands for manipulating the cutter over the surface to be scraped.

A further object of this invention relates to the way in which a novel movement is imparted to the cutter through the medium of a hinged support therefor and a cam member operated by the prime mover to impart swinging movement to the hinge member and, therefore, the cutter mounted thereon.

In the drawing:

Figure 1 is a top plan view of a portable scraper made according to my present invention.

Fig. 2 is a side elevational view thereof; and

Fig. 3 is an end view, parts being broken away to reveal details of construction.

All of the component parts of the portable tool forming the subject matter of the instant invention as shown in the drawing, are mounted on a handle device in the form of an elongated bar 10, sufficiently long to permit the operator to place one end thereof upon his shoulder during use, and to this end, it is to be preferred that a suitable shoulder pad 12 be provided on the said one end of the bar 10.

The opposite or uppermost face of the bar supports a suitable prime mover 14 through the medium of bracket 16 and releasable fasteners 18. The prime mover 14 chosen for illustration comprises an air motor whose valve means is controlled by a lever 20 and the'source of fluid pressure is directed thereto by means of conduit 22.

It is desirable to provide a speed reducer 24 for the prime mover 14 operably connected therewith through coupling 26- and the speed reducer 24 is likewise mounted on the normally uppermost face of the bar 10 through the medium of bracket means 28 and releasable fasteners 30.

Output shaft 32 of the speed reducer 24 is provided with a chuck 34 receiving a pin 36 having a cam' 38 rigidly secured thereto. Scraper or cutter blade 40 is secured directly to an extension 42 of a swingable element 44 interposed between the bar 10 and shaft 32, chuck 34 and cam 38.

Element 44 is attached directly to the bar 10 by hinge means 46 adapting the element 44 therefore, for swinging movement about an axis that is preferably parallel with the longitudinal axis -of bar 10 and therefore, the axis of rotation of shaft 32. Element 44 is spring-loaded and to this end, there is interposed a coil spring 48 between the element 44 and the upper face of bar 10 for yieldably biasing the element 44 toward the uppermost end of its path of travel. Such upward movement is limited by stop means that includes a pin 50 mounted on the bar 10 extending loosely through the element 44 and terminating in a head 52 against which the element 44' ment 44 may be adjusted as necessary or desirable.

An upstanding lug 54 aligned with the cam 38 for engagement thereby, is formed rigidly on the element 44.

It is seen, therefore, that in operation, energization of the prime mover 14 causes rotation of cam 38 through speed reducer 24 and as the cam 38 strikes the lug 54 to swing the element 44 downwardly toward the bar 10 against the action of spring 48, the oscillatory motion of cutter 40 continues until lever 20 is released to cut off the flow of air to the prime mover 14 by way of conduit 22.

The operator grasps the bar 10, motor 14 and speed reducer 24 to guide the cutter 40 as the upper end of the bar 10 rests on his shoulder and when the cutter 40 is brought into engagement with the surface to be scraped, the oscillatory movement of the cutter 40 produces a desirable wavy pattern in the work and the entire surface can be scraped within a relatively short period of time.

Longitudinal guides or guiding surfaces on the bed of a planer, lathe or the like along which a table or carriage moves, as well as gibs employed to hold parts together or afford a bearing surface are conventionally scraped to provide oil pockets to maintain an oil film on the relatively sliding surfaces. Otherwise, friction prevents proper operation, increases wear and permits oxidation and rust. Wavy or irregular grooves are preferred to retain the lubricant and through use of the above-described tool, a desired pattern can be easily and quickly formed. Crisscross grooves may be formed diagonally across such ways and gibs to present an attractive, yet useful surface with but little skill on the part of the operator.

It has been found through use of a tool of this character that many hours of time and labor can be saved and the aforementioned surfaces are more effectively and properly scraped than has heretofore been possible through use of hand scrapers or power devices previously employed for such purpose.

Having thus described the invention what is claimed as new and desired to be secured by Letters Patent is:

1. A portable power scraper comprising an elongated bar; an elongated element overlying the bar adjacent one end of the latter in parallelism therewith, one end of the element extending beyond said one end of the bar; hinge means mounting the element on the bar for swinging movement toward and away from one face of the bar about an axis adjacent one longitudinal edge of the element and parallel with the longitudinal axes of the bar and the element; spring means between said one face of the bar and the proximal face of the element yieldably biasing the element away from the bar; a lug on the opposite face of the element; a cutter on said one end of the element; a shaft carried by the bar in spaced relationship to said one face thereof; and cam means secured to the shaft and disposed to intermittently engage the lug as the shaft is i'otated to swing the element toward the bar against the action of said spring means.

2. A portabletpower scraper comprising an elongated bat; an elongated element overlying the bar adjacent one end of the latter in parallelism therewith, one end of the element extending befyondsaid one end of the bar; hinge means mounting the element on the bar for swinging movement toward and away fron oneface of the bar about an axis adjacent one longitudinal edge of the element and parallel with the longitudinal axes of the bar and the element; spring means betweensaid one face of the bar and the proximalface of the element yieldablyv biasing the element away from thebar; a lug on the opposite face of the element; a cutter on said one end of the element; a shaft carried by the bar in spaced relationship.

to said one face 'th'er'eo'f; cam means secured to the shaft and disposed to intermittently-engage the lug as the shaft is rotated to swing the element toward the bar against the action of said spring means; and a prime mover carried by the bar and driving said shaft.

3. A portable power scraper comprising an elongated bar; an elongated elementovefl'yingthe bar adjacent one el'em'entextending beyond said one end of the :baqhing'e means mounting the element on the bar for swinging movement toward and away from one face of the bar face of the element; a cutter on said one end of the element; a shaft carried-by the bar in spacedrelationship to said one face thereofi cam means secured 'to the shaft and disposed to intermittently engage the lug as the shaft is rotated to swing the element toward the bar against the action of said 'sp'ringmeans; a prime mover carried end of the latter'i'n parallelism therewith, one end of the 25 by the bar and driving said shaft; and a shoulder pad mounted on the opposite face of the bar at the opposite end thereof.

References Cited in the file of this .patent UNITED STATES PATENTS,

1,315,964 Jantsch f.. 'Sept. 1-6, 1919 2,503,539 Aspeek Apr. 11, 1950 2,722,072 Aspeek Nov. 1, 1955 

